readme: also replace relative Markdown links, not just relative images #689
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Our initial solution had perhaps a bit of tunnel vision by focusing on replacing only relative Markdown images, while it rather should replace all of the Markdown links we can find, images or not.
One example where this proved to be an issue is in https://pgt.dev/extensions/pg_partman. Since their README has stuff like
[pg_partman.md](doc/pg_partman.md)
, pgt.dev incorrectly linked that to https://pgt.dev/extensions/doc/pg_partman.md.With the changes proposed in this PR, pgt.dev would now link to https://raw.githubusercontent.com/pgpartman/pg_partman/master/doc/pg_partman.md instead.